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181 lines
5.2 KiB
181 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Typhoon Radio Card driver for radio support |
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* (c) 1999 Dr. Henrik Seidel <[email protected]> |
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* |
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* Notes on the hardware |
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* |
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* This card has two output sockets, one for speakers and one for line. |
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* The speaker output has volume control, but only in four discrete |
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* steps. The line output has neither volume control nor mute. |
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* |
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* The card has auto-stereo according to its manual, although it all |
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* sounds mono to me (even with the Win/DOS drivers). Maybe it's my |
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* antenna - I really don't know for sure. |
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* |
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* Frequency control is done digitally. |
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* |
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* Volume control is done digitally, but there are only four different |
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* possible values. So you should better always turn the volume up and |
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* use line control. I got the best results by connecting line output |
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* to the sound card microphone input. For such a configuration the |
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* volume control has no effect, since volume control only influences |
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* the speaker output. |
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* |
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* There is no explicit mute/unmute. So I set the radio frequency to a |
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* value where I do expect just noise and turn the speaker volume down. |
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* The frequency change is necessary since the card never seems to be |
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* completely silent. |
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* |
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* Converted to V4L2 API by Mauro Carvalho Chehab <[email protected]> |
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*/ |
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#include <linux/module.h> /* Modules */ |
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#include <linux/init.h> /* Initdata */ |
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#include <linux/ioport.h> /* request_region */ |
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#include <linux/videodev2.h> /* kernel radio structs */ |
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#include <linux/io.h> /* outb, outb_p */ |
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#include <linux/slab.h> |
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#include <media/v4l2-device.h> |
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#include <media/v4l2-ioctl.h> |
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#include "radio-isa.h" |
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#define DRIVER_VERSION "0.1.2" |
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MODULE_AUTHOR("Dr. Henrik Seidel"); |
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MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); |
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MODULE_LICENSE("GPL"); |
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MODULE_VERSION("0.1.99"); |
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#ifndef CONFIG_RADIO_TYPHOON_PORT |
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#define CONFIG_RADIO_TYPHOON_PORT -1 |
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#endif |
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#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ |
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#define CONFIG_RADIO_TYPHOON_MUTEFREQ 87000 |
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#endif |
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#define TYPHOON_MAX 2 |
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static int io[TYPHOON_MAX] = { [0] = CONFIG_RADIO_TYPHOON_PORT, |
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[1 ... (TYPHOON_MAX - 1)] = -1 }; |
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static int radio_nr[TYPHOON_MAX] = { [0 ... (TYPHOON_MAX - 1)] = -1 }; |
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static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ; |
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module_param_array(io, int, NULL, 0444); |
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MODULE_PARM_DESC(io, "I/O addresses of the Typhoon card (0x316 or 0x336)"); |
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module_param_array(radio_nr, int, NULL, 0444); |
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MODULE_PARM_DESC(radio_nr, "Radio device numbers"); |
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module_param(mutefreq, ulong, 0); |
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MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); |
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struct typhoon { |
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struct radio_isa_card isa; |
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int muted; |
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}; |
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static struct radio_isa_card *typhoon_alloc(void) |
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{ |
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struct typhoon *ty = kzalloc(sizeof(*ty), GFP_KERNEL); |
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return ty ? &ty->isa : NULL; |
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} |
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static int typhoon_s_frequency(struct radio_isa_card *isa, u32 freq) |
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{ |
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unsigned long outval; |
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unsigned long x; |
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/* |
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* The frequency transfer curve is not linear. The best fit I could |
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* get is |
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* |
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* outval = -155 + exp((f + 15.55) * 0.057)) |
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* |
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* where frequency f is in MHz. Since we don't have exp in the kernel, |
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* I approximate this function by a third order polynomial. |
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* |
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*/ |
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x = freq / 160; |
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outval = (x * x + 2500) / 5000; |
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outval = (outval * x + 5000) / 10000; |
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outval -= (10 * x * x + 10433) / 20866; |
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outval += 4 * x - 11505; |
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outb_p((outval >> 8) & 0x01, isa->io + 4); |
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outb_p(outval >> 9, isa->io + 6); |
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outb_p(outval & 0xff, isa->io + 8); |
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return 0; |
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} |
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static int typhoon_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) |
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{ |
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struct typhoon *ty = container_of(isa, struct typhoon, isa); |
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if (mute) |
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vol = 0; |
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vol >>= 14; /* Map 16 bit to 2 bit */ |
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vol &= 3; |
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outb_p(vol / 2, isa->io); /* Set the volume, high bit. */ |
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outb_p(vol % 2, isa->io + 2); /* Set the volume, low bit. */ |
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if (vol == 0 && !ty->muted) { |
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ty->muted = true; |
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return typhoon_s_frequency(isa, mutefreq << 4); |
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} |
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if (vol && ty->muted) { |
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ty->muted = false; |
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return typhoon_s_frequency(isa, isa->freq); |
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} |
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return 0; |
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} |
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static const struct radio_isa_ops typhoon_ops = { |
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.alloc = typhoon_alloc, |
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.s_mute_volume = typhoon_s_mute_volume, |
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.s_frequency = typhoon_s_frequency, |
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}; |
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static const int typhoon_ioports[] = { 0x316, 0x336 }; |
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static struct radio_isa_driver typhoon_driver = { |
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.driver = { |
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.match = radio_isa_match, |
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.probe = radio_isa_probe, |
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.remove = radio_isa_remove, |
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.driver = { |
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.name = "radio-typhoon", |
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}, |
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}, |
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.io_params = io, |
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.radio_nr_params = radio_nr, |
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.io_ports = typhoon_ioports, |
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.num_of_io_ports = ARRAY_SIZE(typhoon_ioports), |
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.region_size = 8, |
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.card = "Typhoon Radio", |
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.ops = &typhoon_ops, |
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.has_stereo = true, |
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.max_volume = 3, |
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}; |
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static int __init typhoon_init(void) |
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{ |
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if (mutefreq < 87000 || mutefreq > 108000) { |
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printk(KERN_ERR "%s: You must set a frequency (in kHz) used when muting the card,\n", |
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typhoon_driver.driver.driver.name); |
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printk(KERN_ERR "%s: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108000)\n", |
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typhoon_driver.driver.driver.name); |
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return -ENODEV; |
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} |
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return isa_register_driver(&typhoon_driver.driver, TYPHOON_MAX); |
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} |
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static void __exit typhoon_exit(void) |
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{ |
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isa_unregister_driver(&typhoon_driver.driver); |
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} |
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module_init(typhoon_init); |
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module_exit(typhoon_exit); |
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